 /*******************************************************************************
  * Copyright (c) 2005, 2006 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.ui.services;

 import org.eclipse.ui.ISourceProvider;

 /**
  * <p>
  * A service that responds to changes in one or more sources. These sources can
  * be plugged into the service. Sources represent a common event framework for
  * services.
  * </p>
  * <p>
  * Clients must not extend or implement.
  * </p>
  *
  * @since 3.2
  */
 public interface IServiceWithSources extends IDisposable {

     /**
      * Adds a source provider to this service. A source provider will notify the
      * service when the source it provides changes. An example of a source might
      * be an active editor or the current selection. This amounts to a pluggable
      * state tracker for the service.
      *
      * @param provider
      * The provider to add; must not be <code>null</code>.
      */
     public void addSourceProvider(ISourceProvider provider);

     /**
      * Removes a source provider from this service. Most of the time, this
      * method call is not required as source providers typically share the same
      * life span as the workbench itself.
      *
      * @param provider
      * The provider to remove; must not be <code>null</code>.
      */
     public void removeSourceProvider(ISourceProvider provider);
 }

